Question: I’m a student at the University of Leeds, England. I am currently undertaking a research project on water recycling for my chemistry degree and would appreciate it if you could send me some technical information (chemistry based if possible) on water purification and recycling techniques.

Philip Mounteney
Leeds, Yorkshire, England

Answer: One of the largest water reuse projects in the world is now under construction in Southern California. It uses state of the art membrane technology to product drinking quality water from municipal sewage. You can learn about this project by going to the following website: www.gwrsystem.com. GWR stands for ground water recovery system here. Hope this helps. For your information, previous studies using conventional chemical means, such as lime clarification, have been scrapped; and this large plant will use microfiltration followed by reverse osmosis.